Greetings,
I have disabled power saving features in linaro ubuntu 11.10 on a PandaBoard, in order to prevent the screen going black, since there is no mouse nor keyboard attached to the board (It is simply displaying videos, in a closed loop). But when I reboot (Or power up after a time with the board off) sometimes this works, and sometimes not. There seems not to be any kind of rule for it to work, it can fail 5 or 6 times (going black after 10 minutes, even when it is set to "never"), and later work ok for 3 or 4 reboots. And then, fail again.
Can anyone enlighten me a bit? Sorry for the joke, but my brain is almost as dark as black the screen goes...
thanks in advance,
Sorry for the late response. Got some problems at work, and left this for some while. Now, I have been asigned back to it, and keeps the same.
I turned off power using ubuntu 11.10 method [ http://www.liberiangeek.net/2011/10/ubuntu-screen-going-blank-dark-on-you-st... ] since that is the version used in the linaro image I got working.
Problem is that although it works for the most times, there are few cases in which screen goes black. If you reboot the board, it may work ok.
If possible, I would like to remain in the same version of linaro (I really hate finding new errors and realizing later that had been introduced by software updates, and not by my code...)
I had similar issues with a Beagle clone, and solved it messing with the kernel (disabling the function that made the screen go black) but I prefer not to do that kind of things... Probably because of my lack of confidence (I am not a software guy, just an electronics engineer who has been assigned to a software project...) I prefer to use regular kernels (I mean, not to modify anything).
I am using omap4-extras (Since my application plays videos -or tries to...- at 1080p). I am not really sure if this can have been introduced by this add-on, because I had it installed from the very beginning.
Linaro version is 11.11
Thanks in advance, and please forgive any mistakes in my text.
2012/1/29 nivr nicholas@vanryn.com
Would you mind explaining how you disabled the power saving?
Regards
linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
maybe this will help? http://ubuntuforums.org/archive/index.php/t-1063566.html
On Fri, Feb 10, 2012 at 12:33 AM, E V eviala.es@gmail.com wrote:
Sorry for the late response. Got some problems at work, and left this for some while. Now, I have been asigned back to it, and keeps the same.
I turned off power using ubuntu 11.10 method [ http://www.liberiangeek.net/2011/10/ubuntu-screen-going-blank-dark-on-you-st...] since that is the version used in the linaro image I got working.
Problem is that although it works for the most times, there are few cases in which screen goes black. If you reboot the board, it may work ok.
If possible, I would like to remain in the same version of linaro (I really hate finding new errors and realizing later that had been introduced by software updates, and not by my code...)
I had similar issues with a Beagle clone, and solved it messing with the kernel (disabling the function that made the screen go black) but I prefer not to do that kind of things... Probably because of my lack of confidence (I am not a software guy, just an electronics engineer who has been assigned to a software project...) I prefer to use regular kernels (I mean, not to modify anything).
I am using omap4-extras (Since my application plays videos -or tries to...- at 1080p). I am not really sure if this can have been introduced by this add-on, because I had it installed from the very beginning.
Linaro version is 11.11
Thanks in advance, and please forgive any mistakes in my text.
2012/1/29 nivr nicholas@vanryn.com
Would you mind explaining how you disabled the power saving?
Regards
linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
Nope :(
Already tried most of the answers given. Problem is that is working... Most of the boots. But, as I said, sometimes it just goes black. Since I am not in front of the board (And it has no keyboard nor mouse, just connected to screen) can't do nothing with it...
2012/2/10 John Rigby john.rigby@linaro.org
maybe this will help? http://ubuntuforums.org/archive/index.php/t-1063566.html
The problem I had was screen blanking in X. Since X is run with the username 'linaro', I put the following lines in a startup script (/etc/rc.local) and it seems to do the trick: su linaro -c "xset -display :0 -dpms" su linaro -c "xset -display :0 s off" Does this help in any way?
Will try and report. It is hard to say if something solves it, since it may fail after 10 or 20 boots, or 100... X is always run with the username 'linaro' or depends on the ubuntu user?
2012/2/13 nivr nicholas@vanryn.com
The problem I had was screen blanking in X. Since X is run with the username 'linaro', I put the following lines in a startup script (/etc/rc.local) and it seems to do the trick: su linaro -c "xset -display :0 -dpms" su linaro -c "xset -display :0 s off" Does this help in any way?
It depends on the ubuntu user, but I'm running a linaro pre-made image for xbmc on the pandaboard so for me X is always run as 'linaro' user. You should check yours.
I put those lines in rc.local so they are always executed on bootup. A better solution would probably be to put the corresponding settings in xorg.conf, but since I don't have an exiting one (ubuntu now defaults to not having one I believe), it was easier for me to just do it this way.
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E V -
John Rigby -
nivr